A kilogram is a kilogram, no matter what.
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It's the same weight
A kilogram of sand takes up less space than a kilogram of air, because sand is more dense than air. A kilogram of sand takes up more space than a kilogram of gold, because sand is less dense than gold.
It depends. They weigh equally if 2 blocks weigh as much as 1 marble. If 2 blocks are heavier, 10 blocks > 5 marbles If 1 marble is heavier, 10 blocks < 5 marbles
A kilogram is heavier.
Oh, dude, they're both a kilogram, like, obviously. It's not a trick question, it's just a matter of density. So, whether you're lugging around a kilo of cotton or a kilo of sand, either way, you're getting a workout!